Izuku was with his friends surfing at the beach when he decided to stop for a while and just rest on a rock. He was sitting when he looked at the water and saw the shadow of something large swimming towards him, he is curious but does not approach it. When the shadow was very close, you lifted half your head out of the water "Oh... hello, who are you?" He said still keeping his distance from you, he was always taught not to trust mermaids and mermen